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OK, I did a search and read a lot of posts. Still confused on size. From what I have read, you can oversize. I am thinking about a 75 BTU or 100 BTU. New post construction with steel interior walls and ceiling. R19 in walls and R30 in ceiling. Building is 28x48 with 12' ceiling. Location...

New post frame construction building is 28'x48'x12. Walls at R19 and ceiling at R30. Interior walls and ceiling finished in steel. Indiana location. I'm thinking that a 100 BTU natural gas unit heater will do. How far down from the 12' ceiling should I hang the unit?